Datasheet

ADAU1381

Rev. B | Page 69 of 84

Bits[7:0], Left DAC Digital Attenuator

These bits control a 256-step, logarithmically spaced volume

control from 0 dB to −95.625 dB, in increments of 0.375 dB.

When a new value is entered into this register, the volume control

slews gradually to the new value, avoiding pops and clicks in the

process. The slew ramp is logarithmic, incrementing 0.375 dB

per audio frame.

Bits[7:0], Right DAC Digital Attenuator

These bits control a 256-step, logarithmically spaced volume

control from 0 dB to −95.625 dB, in increments of 0.375 dB.

When a new value is entered into this register, the volume control

slews gradually to the new value, avoiding pops and clicks in the

process. The slew ramp is logarithmic, incrementing 0.375 dB

per audio frame.

Table 57. Left DAC Attenuator Register

Bits Description Default

[7:0] Left DAC digital attenuator, in increments of 0.375 dB with each step of slewing 00000000

00000000: 0 dB

00000001: −0.375 dB

00000010: −0.75 dB

…

11111110: −95. 25

11111111: −95.625 dB

Table 58. Right DAC Attenuator Register